BT Voyager 2110 - Problem

I purchased the BT Voyager from PlusNet when I joined the Broadband revolution. Unfortunately I'm finding the range between router and laptop rather dissapointing. At worst I would say that the distance between the two is 30 feet and yet I'm getting only 1 bar on the signal strength. The only barrier is a couple of plasterboard walls (I live in a modern house).

Is there some sort of setting where I can turn up the signal from the router.